Temperature dependent phonon Raman scattering of Heusler alloy Co 2Mn xFe 1-xAl/GaAs films grown by molecular-beam epitaxy

Zhenni Zhan; Zhigao Hu; Kangkang Meng; Jianhua Zhao; Junhao Chu

doi:10.1039/c2ra21255b

Temperature dependent phonon Raman scattering of Heusler alloy Co ₂Mn _xFe _1-xAl/GaAs films grown by molecular-beam epitaxy

Zhenni Zhan, Zhigao Hu, Kangkang Meng, Jianhua Zhao, Junhao Chu

School of Physics and Electronic Science

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Co ₂Mn _xFe _1-xAl full-Heusler alloy films have been grown on GaAs (001) by molecular-beam epitaxy. Three representative phonon modes observed from Raman scattering show different variation trends in the temperature range 87-873 K. The 2F _1u modes at 569 and 947 cm ^-1 show anomalous change with increasing temperature, which can be due to the phase transition. The Curie temperature (T _c) can be evaluated as 828 K for x = 0, 823 K for x = 0.3, 818 K for x = 0.7, and 788 K for x = 1, respectively. This can be ascribed to the fact that the lattice parameter of the films becomes larger with Mn composition.

Original language	English
Pages (from-to)	9899-9903
Number of pages	5
Journal	RSC Advances
Volume	2
Issue number	26
DOIs	https://doi.org/10.1039/c2ra21255b
State	Published - 28 Oct 2012

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title = "Temperature dependent phonon Raman scattering of Heusler alloy Co 2Mn xFe 1-xAl/GaAs films grown by molecular-beam epitaxy",

abstract = "Co 2Mn xFe 1-xAl full-Heusler alloy films have been grown on GaAs (001) by molecular-beam epitaxy. Three representative phonon modes observed from Raman scattering show different variation trends in the temperature range 87-873 K. The 2F 1u modes at 569 and 947 cm -1 show anomalous change with increasing temperature, which can be due to the phase transition. The Curie temperature (T c) can be evaluated as 828 K for x = 0, 823 K for x = 0.3, 818 K for x = 0.7, and 788 K for x = 1, respectively. This can be ascribed to the fact that the lattice parameter of the films becomes larger with Mn composition.",

author = "Zhenni Zhan and Zhigao Hu and Kangkang Meng and Jianhua Zhao and Junhao Chu",

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T1 - Temperature dependent phonon Raman scattering of Heusler alloy Co 2Mn xFe 1-xAl/GaAs films grown by molecular-beam epitaxy

AU - Zhan, Zhenni

AU - Hu, Zhigao

AU - Meng, Kangkang

AU - Zhao, Jianhua

AU - Chu, Junhao

PY - 2012/10/28

Y1 - 2012/10/28

N2 - Co 2Mn xFe 1-xAl full-Heusler alloy films have been grown on GaAs (001) by molecular-beam epitaxy. Three representative phonon modes observed from Raman scattering show different variation trends in the temperature range 87-873 K. The 2F 1u modes at 569 and 947 cm -1 show anomalous change with increasing temperature, which can be due to the phase transition. The Curie temperature (T c) can be evaluated as 828 K for x = 0, 823 K for x = 0.3, 818 K for x = 0.7, and 788 K for x = 1, respectively. This can be ascribed to the fact that the lattice parameter of the films becomes larger with Mn composition.

AB - Co 2Mn xFe 1-xAl full-Heusler alloy films have been grown on GaAs (001) by molecular-beam epitaxy. Three representative phonon modes observed from Raman scattering show different variation trends in the temperature range 87-873 K. The 2F 1u modes at 569 and 947 cm -1 show anomalous change with increasing temperature, which can be due to the phase transition. The Curie temperature (T c) can be evaluated as 828 K for x = 0, 823 K for x = 0.3, 818 K for x = 0.7, and 788 K for x = 1, respectively. This can be ascribed to the fact that the lattice parameter of the films becomes larger with Mn composition.

UR - https://www.scopus.com/pages/publications/84867351004

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DO - 10.1039/c2ra21255b

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SN - 2046-2069

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JO - RSC Advances

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ER -

Temperature dependent phonon Raman scattering of Heusler alloy Co ₂Mn _xFe _1-xAl/GaAs films grown by molecular-beam epitaxy

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